<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title>CodePen - Masonry Dynamic Column Flexbox (CSS Only)</title>
  <link rel="stylesheet" href="./style.css">

</head>
<body>
<!-- partial:index.partial.html -->
<div class="background">
  <div class="container" data-container>
    <div class="card" data-card style="background-image: url('https://source.unsplash.com/random?1')">1</div>
    <div class="card" style="background-image: url('https://source.unsplash.com/random?2')">2</div>
    <div class="card" style="background-image: url('https://source.unsplash.com/random?3')">3</div>
    <div class="card" style="background-image: url('https://source.unsplash.com/random?4')">4</div>
    <div class="card" style="background-image: url('https://source.unsplash.com/random?5')">5</div>
    <div class="card" style="background-image: url('https://source.unsplash.com/random?6')">6</div>
  </div>
  <div class="buttons">
    <button data-remove>–</button>
    <button data-add>+</button>
  </div>
</div>
<!-- partial -->
  <script  src="./script.js"></script>

</body>
</html>
